Now that iOS4 is out of the door, most apps need a quick update to support multitasking. TomTom's first with a multitasking navigation app, but CoPilot and Navigon have both shown off what to expect from theirs too.

When I published the turn-by-turn navigation app battlemodo, many readers asked me to evaluate some other popular choices. Because everything I do, I do for you, here are CoPilot, GoKivo and Sygic, a.k.a. the best of the rest:

You might be familiar with the CoPilot Live, a $299 software and hardware add-on for mobile PCs that turns that smartphone into a GPS unit. Its tiny GPS receiver communicates with the phone via Bluetooth, and the maps are stored in a flash memory card. Now the CoPilot Live's maker, ALK, has released a special…